R1:3085e5284342

Make upcoming events view more viewer-oriented

Summary:
Ref T11326. Try to make this a little more useful:

- Don't show entire attendee list (not useful?)
- Show host (useful?)
- Show your own status prominently (attending vs declined vs invited).
- Show cancelled events prominently.

Test Plan: {F1723550}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11326

Differential Revision: https://secure.phabricator.com/D16299